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Texas Instruments bq25157 1-Cell Linear Battery Charger

Texas Instruments bq25157 1-Cell Linear Battery Charger is a highly integrated battery charge management IC that integrates the most common functions for wearable, portable, and small medical devices. These functions include a charger, a regulated output voltage rail for system power, ADC for battery and system monitoring, an LDO, and a push-button controller. The bq25157 has the Input Supply Over Voltage Threshold (V_OVP) threshold set to 6.2V.

The Texas Instruments bq25157 IC integrates a linear charger with Power Path that enables quick and accurate charging for small batteries while providing a regulated voltage to the system. The regulated system voltage (PMID) output may be configured through I²C based on the recommended operating condition of downstream IC’s and system loads for optimal system operation. The device supports charge current up to 500mA and supports termination current down to 0.5mA for maximum charge. The battery is charged using a standard Li-Ion charge profile with three phases: pre-charge, constant current, and constant voltage regulation.

Features

Linear battery charger with 1.25mA to 500mA fast charge current range
- 0.5% Accurate I²C programmable battery regulation voltage ranging from 3.6V to 4.6V in 10mV steps
- Configurable termination current supporting down to 0.5mA
- 20V tolerant input with typical 3.4V to 6.2V input voltage operating range
- Programmable thermal charging profile, fully configurable hot, warm, cool, and cold thresholds
Power Path management for powering system and charging battery
- Dynamic power path management optimizes charging from weak adapters
- Advanced I²C control allows the host to disconnect the battery or adapter as needed
I²C Configurable load switch or up to 150mA LDO output
- Programmable range from 0.6V to 3.7V in 100mV steps

Ultra-low Iddq for extended battery life
- 10nA ship mode battery I_q
- 400nA I_q while powering the system (PMID and V_DD on)
One push-button wake-up and reset input with adjustable timers
- Supports system power cycle and HW reset
16-Bit ADC
- Monitoring of charge current, battery thermistor, and battery, input and system (PMID) voltages
- General purpose ADC input
Always on 1.8V VDD LDO supporting loads up to 10mA
20-pin 2mm x 1.6mm CSP package
12mm² total solution size

Applications

Headsets, earbuds, and hearing aids
Smartwatches and smart trackers

Wearable fitness and activity monitors
Blood glucose monitors

Texas Instruments bq25157 1-Cell Linear Battery Charger

Features

Applications

Simplified Schematic

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